PyChain Ledger

I did following steps for this assignment:

Step 1: Create a Record Data Class

@dataclass
class Record:
    sender: str
    receiver: str
    memo: str
    amount: float 

Step 2: Modify the Existing Block Data Class to Store Record Data

@dataclass
class Block:
    record: Record
    creator_id: int
    prev_hash: str = "0"
    timestamp: str = datetime.datetime.utcnow().strftime("%H:%M:%S")
    nonce: int = 0

Step 3: Add Relevant User Inputs to the Streamlit Interface

tr_sender = st.text_input("Sender Account")

tr_receiver = st.text_input("Receiver Account")

tr_amount = st.text_input("Amount")

tr_memo = st.text_input("Transaction Memo")

if st.button("Add Block"):
    prev_block = pychain.chain[-1]
    prev_block_hash = prev_block.hash_block()

    new_record= Record(
        sender=tr_sender,
        receiver=tr_receiver,
        memo=tr_memo,
        amount=tr_amount)

    new_block = Block(
        record = new_record, 
        creator_id=42,
        prev_hash=prev_block_hash
    )

    pychain.add_block(new_block)
    st.balloons()

Step 4: Test the PyChain Ledger by Storing Records

1. Run Application

2. Streamlit UI

3. Add transactions

4. Add transaction with higher difficulty

5. Verfiy the Chain

Files

PyChain.py